Has anyone else gotten the dreaded "This delay is already scheduled!"?
 The exclaimation suggests the author felt this should never happen;
as a possible bug somewhere?

I've gotten it a couple of times, this time I had interrupted
something (taking longer than I thought?) and a flurry of debuggers
with that message, but VM pegged at 100% and could not gain control of
the image.  Had to kill -9 it.